E. P. Snijdkrs 
431 
other animals.) If vve accept this view, however, we must admit that its 
pathogenic power, if present, is of little importance, and either that the 
formation of an appreciable number of cysts very seldom occurs, or that the 
infection is most transitory. 
The figures were drawn from the oocysts as they appeared in a suspension of the fresh faeces 
in a 2 per cent, solution of eosin (with 0-9 per cent. NaCl). They are necessarily somewhat 
schematic. [The author’s original figures (D excepted) show a faint line externally which delimits 
the evst wall; this line unfortunately has been omitted from the figure as reproduced. The fine 
outer line should circumscribe the cyst at a distance equal to the thickness of the black 
contour.— Ed.] Magnification x 1000. 
A. Oocyst with undifferentiated sphere showing a honeycomb structure. 
B. Completely differentiated oocyst, containing typical sporocysts and sporozoites. 
C. The same, but sporocysts and sporozoites somewhat irregular. 
D. Oocyst with atypical sporozoites, looking “fixed,” coagulated, and staining red with eosin. 
If we now compare my case with those of Wenyon, Roche, and Dobell, 
we see that they are similar in the above-mentioned respects; and it should 
be noted that in most cases of Isosjpora infection also this absence of clinical 
symptoms and this short duration are circumstances almost constantly 
present. 
